JIS G 3463-1994 Stainless steel for boilers and heat exchangers

Stainless steel pipes for boilers and heat exchangers conforming to JIS G 3463

Stainless steel pipes for boilers and heat exchangers conforming to JIS G 3463 are suitable for the production and manufacture of the components and parts of boilers and heat exchangers which require superior corrosion resistance in addition to general strength and creep resistance at high temperature. The material for these steels conforms to the requirements of JIS G 3463 and is mainly divided into two types; Austenitic steels (SUS304T and SUS316T) and Ferritic steels (SUS430T).

Austenitic steels contain more than 18% chromium, to 8% nickel and 0.1% carbon, and are non-magnetic. They are used mainly in the sensitive device components that handle high corrosion resistant liquids, such as widely-used steam. Ferritic steels contain more than 17% chromium, 0.12% carbon and 0.75% molybdenum. They are magnetic, hence can be easily detected. These steels possess excellent heat resistance, but poor corrosion resistance, and therefore are mainly used in heat exchangers and other related heat resistant applications.

JIS G 3463 covers the spiral welded pipes for the manufacture of boilers and heat exchangers. The minimum wall-thickness of the pipes is 2.3mm and the tolerance for the inner diameter is -0.5 percent (+0 percent for ferritic steels) and for the outer diameter 3.2 percent (1.5 percent for ferritic steels). The fracture test and flaring tests are normally carried out for these steels, and these steels are selected by taking into account the application of the product and the operating environment.

The stainless steel pipes conforming to JIS G 3463 are made of hot rolled stainless steel plate or strip and there’re five types; type A (annealed), type HA (cold-worked) type H (hard-tempered), type S (stress relieved) and type SZ (stress relieved and five tempered). The working pressure of the stainless steel pipes of type A and HA are 9.8MPa and 13.7MPa, respectively. Type H and S pipes have a working pressure of 15.7 MPa and 20.6 MPa respectively. These steels are mainly used in the fabrication of boilers and heat exchangers, and they are selected according to the strength of the product and the operating environment.

In conclusion, stainless steel pipes conforming to JIS G 3463 are used for the production and manufacture of the components and parts of boilers and heat exchangers that require superior corrosion resistance in addition to general strength and creep resistance at high temperature. These steels are mainly divided into two types; austenitic steels and ferritic steels and have five types, including type A (annealed) type HA (cold-worked) type H (hard-tempered), type S (stress relieved) and type SZ (stress relieved and five tempered).

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JIS G 3463-1994 is a standard for commercial stainless steel used in boilers and heat exchangers. This type of steel is designed to be resistant to corrosion as well as to high temperatures and pressures. It is often used in applications where oxidation or contamination can cause rust or other damage to materials.

The standard defines how the materials should be produced, tested and inspected. It also includes requirements for testing and analysis of the materials chemical composition as well as its mechanical properties. To comply with the standard, the material must meet specific requirements of tensile strength, yield strength, strain hardening, creep strength and microstructure.

The chemical composition of the materials is specified in the standard and should be verified by laboratory analysis. This is done to ensure that the correct grade of stainless steel is selected for the particular application. The presence of certain elements, such as chromium, molybdenum, and nitrogen, is also tested and reported.

After the material is manufactured as per the standard requirements, it should be tested further. Mechanical testing is performed to measure the tensile strength, yield strength, strain hardening, and creep strength. Additionally, hardness and impact testing is used to verify the mechanical properties. The final product should then be inspected to ensure it meets the requirements.

Overall, JIS G 3463-1994 is a fantastic standard for stainless steel used in boilers and heat exchangers. Since the material is specifically designed for these applications, it is significantly more resistant to corrosion and other potential damage. The standard also covers testing and inspection, helping to ensure that only the best quality product is used in these important pieces of equipment.